Sirhan Sirhan, the assassin of RFK, is said to have been stabbed to death in California's prison

Sirhan Sirhan, the man convicted of murdering Robert F. Kennedy in 1968, was hospitalized after being stabbed to death on Friday afternoon in a San Diego jail. A source confirmed to the Associated Press that it was the man who was sentenced to life imprisonment in connection with the death of Kennedy, a US Senator from New York. He was assassinated at the Ambassador Hotel in Los Angeles after winning the Democratic presidential code in California in 1968.

Sirhan is said to have been in a stable state after the attack. Circumstances that led to the knife-cutting were not immediately known.

RFK GRANDDAUGHTER SAOIRSE KENNEDY HILL, 22, TOT AT FAMILY COMPOUND

Sirhan Sirhan was convicted in 1968 of assassination of Democratic presidential candidate Robert Kennedy. (Reuters)

"The suspect of the attack was identified and sent to the Department of Administrative Separation of the Prison in anticipation of an investigation," said the California Department of Corrections and Rehabilitation, according to Los Angeles-based KABC-TV.

He takes place at the Richard J. Donovan Correctional Facility.

This is an evolving story. Look for updates. The Associated Press contributed to this report.